/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.calcite.sql;

import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.util.UnmodifiableArrayList;

import com.google.common.base.Preconditions;

import java.util.List;

/**
 * Implementation of {@link SqlCall} that keeps its operands in an array.
 */
public class SqlBasicCall extends SqlCall {
    private SqlOperator operator;
    public final SqlNode[] operands;
    private final SqlLiteral functionQuantifier;
    private final boolean expanded;

    public SqlBasicCall(
            SqlOperator operator,
            SqlNode[] operands,
            SqlParserPos pos) {
        this(operator, operands, pos, false, null);
    }

    protected SqlBasicCall(
            SqlOperator operator,
            SqlNode[] operands,
            SqlParserPos pos,
            boolean expanded,
            SqlLiteral functionQualifier) {
        super(pos);
        this.operator = Preconditions.checkNotNull(operator);
        this.operands = operands;
        this.expanded = expanded;
        this.functionQuantifier = functionQualifier;
    }

    public SqlKind getKind() {
        return operator.getKind();
    }

    @Override public boolean isExpanded() {
        return expanded;
    }

    @Override public void setOperand(int i, SqlNode operand) {
        operands[i] = operand;
    }

    public void setOperator(SqlOperator operator) {
        this.operator = Preconditions.checkNotNull(operator);
    }

    public SqlOperator getOperator() {
        return operator;
    }

    public SqlNode[] getOperands() {
        return operands;
    }

    public List<SqlNode> getOperandList() {
        return UnmodifiableArrayList.of(operands); // not immutable, but quick
    }

    @SuppressWarnings("unchecked")
    @Override public <S extends SqlNode> S operand(int i) {
        return (S) operands[i];
    }

    @Override public int operandCount() {
        return operands.length;
    }

    @Override public SqlLiteral getFunctionQuantifier() {
        return functionQuantifier;
    }

    @Override public SqlNode clone(SqlParserPos pos) {
        return getOperator().createCall(getFunctionQuantifier(), pos, operands);
    }

}

// End SqlBasicCall.java
